File: //proc/fs/ext4/sda1/mb_groups
#group: free frags first [ 2^0 2^1 2^2 2^3 2^4 2^5 2^6 2^7 2^8 2^9 2^10 2^11 2^12 2^13 ]
#0 : 28511 1 4257 [ 1 1 1 1 1 0 1 0 1 1 1 1 0 3 ]
#1 : 1990 19 184 [ 14 6 11 6 3 3 3 2 5 0 0 0 0 0 ]
#2 : 6371 17 6871 [ 11 10 9 8 0 3 0 0 2 1 1 0 1 0 ]
#3 : 15051 5 129 [ 1 1 2 2 1 3 1 0 2 4 2 3 1 0 ]
#4 : 12962 5 11264 [ 2 2 1 3 2 1 1 0 2 0 2 1 0 1 ]
#5 : 4311 3 129 [ 1 1 3 3 3 2 3 3 2 2 0 1 0 0 ]
#6 : 31354 1 1414 [ 0 1 0 1 1 1 1 0 0 1 0 1 1 3 ]
#7 : 32639 1 129 [ 1 1 1 1 1 1 1 0 1 1 1 1 1 3 ]